ERA5 almanac comparison — 8 years of real data
Nashville vs San Diego: weather in August
San Diego is the clear winner for sun in August: 90% of days historically clear versus just 32% in Nashville — a 58-point gap across 8 years of ERA5 data. Nashville also sees measurably more rain than San Diego this month (47% vs 2% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific August. For this
week’s actual forecast, each destination links to its live page below.
Nashville
TN
- Clear days, August
- 32%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early August (1st–15th)
- 23%
- Late August (16th–end)
- 41%
- Rain frequency
- 47% of days
San Diego
CA
- Clear days, August
- 90%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early August (1st–15th)
- 92%
- Late August (16th–end)
- 88%
- Rain frequency
- 2% of days
Compare Nashville vs San Diego in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.